writer：Y. Ding, W. Bai, J. Sun, Y.u Wu, M. A. Memon, C. Wang, C. Liu,* Y. Huang, J. Geng,*
keywords：Anatase Tio2, Shape-controlled synthesis, Cellulose, Three-dimensional graphene composites, Supercapacitors
source：期刊
specific source：ACS Appl. Mater. Interfaces 2016, 8, 12165–12175
Issue time：2016年
The morphologies of transition metal oxides have decisive impact on the performance of their applications. Here, we report a new and facile strategy forin situ preparation of anatase TiO2 nanospindles in three-dimensional reduced graphene oxide (RGO), structure (3D TiO2@RGO) using cellulose as both an intermediate agent eliminating the negative effect of graphene oxide (GO) on the growth of TiO2 crystals and as a structure-directing agent for the shape-controlled synthesis of TiO2 crystals. High-resolution transmission electron microscopy and X-ray diffractometer analysis indicated that the spindle shape of TiO2 crystals was formed through the restriction of the growth of high energy {010} facets due to preferential adsorption of cellulose on these facets. Because of the 3D structure of the composite, the large aspect ratio of the TiO2 nanospindles, and the exposed high-energy {010} facets of the TiO2 crystals, the 3D TiO2@RGO(Ce 1.7) exhibited excellent capacitive performance as an electrode material for supercapacitors, with a high specific capacitance (ca. 397 F g(-1)), a high energy density (55.7 Wh kg(-1)), and a high power density (1327 W kg(-1)) on the basis of the masses of RGO and TiO2. These levels of capacitive performance far exceed those of previously reported TiO2-based composites.